1. Heat 1 tablespoon of the oil in a saucepan and add the onion. Fry gently for 5 minutes until softened.
2. Add the garlic, ginger and spices and fry for a further minute. Add the chopped tomatoes and chillies and cook for another minute.
3. Add the pumpkin and curry paste and fry gently for 3-4 minutes before adding the stock.
4. Stir well, bring to the boil and simmer for 20 minutes until the pumpkin is tender.
5. Thickly slice the banana and add to the pumpkin along with the chickpeas. Simmer for a further 5 minutes.
6. Season to taste with salt and pepper and add the chopped coriander. Serve immediately, garnished with coriander sprigs and some rice or naan bread.